Answer:
(p
21
q
−15
r
−3
)
3
1
=(
15
p
15(
3(
21(
=
5
7
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Answers & Comments
Answer:
(p
21
q
−15
r
−3
)
3
1
=(
q
15
r
3
p
21
)
3
1
q
15(
3
1
)
r
3(
3
1
)
p
21(
3
1
)
=
q
3
15
r
3
3
p
3
21
=
q
5
r
p
7